Title :
A high-resolution micro-circular-polarization-analyzer array for real-time active circular polarization imaging
Author :
Zhao, Xiaojin ; Bermak, Amine ; Boussaid, Farid ; Yao, Lishuang ; Chigrinov, Vladimir G.
Author_Institution :
Dept. of ECE, Hong Kong Univ. of Sci. & Technol., Hong Kong, China
Abstract :
In this paper, a high-resolution micro-circular-polarization-analyzer (MCPA) array is presented and characterized. MCPAs for extracting right-handed and left-handed circularly polarized components of incident light are implemented by fabricating polymerizable-liquid-crystal (PLC) micro-retarders with perpendicular fast axes on top of a 45° laminated linear polarizing film. With sulfonic-dye-1 (SD1) as the PLC photoalignment material, an MCPA feature size as small as 5/Ltm is achieved. In addition, the concept of real-time active circular polarization image sensing and processing with targets illuminated by collimated circularly polarized light is enabled by the MCPA array´s on-chip integration with complementary metal-oxide-semiconductor (CMOS) image sensors.
Keywords :
CMOS image sensors; biomedical optical imaging; light polarisation; liquid crystals; optical retarders; polarimetry; CMOS image sensors; PLC microretarders; PLC photoalignment material; collimated circularly polarised light; high resolution MCPA array; laminated linear polarising film; left handed circularly polarised light; microcircular polarisation analyser array; on chip integration; polymerisable liquid crystal; real time active circular polarisation image sensing; real time active circular polarisation imaging; right handed circularly polarised light; sulfonic-dye-1; CMOS image sensors; CMOS process; High-resolution imaging; Image sensors; Optical arrays; Optical collimators; Optical polarization; Polymer films; Programmable control; Sensor arrays;
Conference_Titel :
Biomedical Circuits and Systems Conference, 2009. BioCAS 2009. IEEE
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-4917-0
Electronic_ISBN :
978-1-4244-4918-7
DOI :
10.1109/BIOCAS.2009.5372086
